THE EFFECTS OF SOLVENTS AND COAGULANTS ON THE FIBER FORMING PROPERTY OF NYLON 3 IN WET SPINNING PROCESS

Abstract

Fiber-forming properties of nylon 3 in the wet spinning process were investigated, using formic, dichloroacetic, trifluoroacetic, sulfuric, nitric acids, aqueous phenol, aqueous calcium thiocyanate, aqueous zinc chloride, aqueous chloral hydrate, aqueous formaline and water as the typical solvents for nylon 3. Film-forming properties of these nylon 3 solutions were also investigated. Following results were obtained.Nylon 3 solutions in formic acid, trifluoroacetic acid and aqueous phenol have film-forming ability in the dry process. The spinning dopes using sulfric acid, nitric acid, and aqueous chloral hydrate have little ability of fiber-forming in the wet and dry spinning process. The spinning solution of nylon 3 in formic acid as the solvent shows excellent fiber-forming property in the wet spinning process, using ethers, esters and alcohols as the coagulants. Thus the fiber forming mechanism of nylon 3 in the wet spinning process using formic acid as the solvent is discussed. Cohesive energy density, strength of hydrogen bonding and proton accepting power of coagulants are found important factors in the wet spinning process of nylon 3.